/*
 * Licensed to the Apache Software Foundation (ASF) under one or more
 * contributor license agreements.  See the NOTICE file distributed with
 * this work for additional information regarding copyright ownership.
 * The ASF licenses this file to You under the Apache License, Version 2.0
 * (the "License"); you may not use this file except in compliance with
 * the License.  You may obtain a copy of the License at
 *
 *    http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package org.apache.dolphinscheduler.plugin.alert.email.template;

import static java.util.Objects.requireNonNull;

import org.apache.dolphinscheduler.alert.api.ShowType;
import org.apache.dolphinscheduler.common.utils.JSONUtils;
import org.apache.dolphinscheduler.plugin.alert.email.EmailConstants;

import org.apache.commons.lang3.StringUtils;

import java.util.Collections;
import java.util.Iterator;
import java.util.LinkedHashMap;
import java.util.List;
import java.util.Map;
import java.util.Set;

import org.slf4j.Logger;
import org.slf4j.LoggerFactory;

import com.fasterxml.jackson.databind.JsonNode;
import com.fasterxml.jackson.databind.node.ArrayNode;
import com.fasterxml.jackson.databind.node.ObjectNode;

import org.springframework.boot.configurationprocessor.json.JSONArray;
import org.springframework.boot.configurationprocessor.json.JSONException;
import org.springframework.boot.configurationprocessor.json.JSONTokener;

public class DefaultHTMLTemplate implements AlertTemplate {

  public static final Logger logger = LoggerFactory.getLogger(DefaultHTMLTemplate.class);

  @Override
  public String getMessageFromTemplate(String content, ShowType showType, boolean showAll) {

    switch (showType) {
      case TABLE:
        return getTableTypeMessage(content, showAll);
      case TEXT:
        return getTextTypeMessage(content);
      default:
        throw new IllegalArgumentException(String.format("not support showType: %s in DefaultHTMLTemplate", showType));
    }
  }

  /**
   * get alert message which type is TABLE
   *
   * @param content message content
   * @param showAll weather to show all
   * @return alert message
   */
  private String getTableTypeMessage(String content, boolean showAll) {

    if (StringUtils.isNotEmpty(content)) {
      List<LinkedHashMap> mapItemsList = JSONUtils.toList(content, LinkedHashMap.class);

      if (!showAll && mapItemsList.size() > EmailConstants.NUMBER_1000) {
        mapItemsList = mapItemsList.subList(0, EmailConstants.NUMBER_1000);
      }

      StringBuilder contents = new StringBuilder(200);

      boolean flag = true;

      String title = "";
      for (LinkedHashMap<String, Object> mapItems : mapItemsList) {

        Set<Map.Entry<String, Object>> entries = mapItems.entrySet();

        Iterator<Map.Entry<String, Object>> iterator = entries.iterator();

        StringBuilder t = new StringBuilder(EmailConstants.TR);
        StringBuilder cs = new StringBuilder(EmailConstants.TR);
        while (iterator.hasNext()) {

          Map.Entry<String, Object> entry = iterator.next();
          t.append(EmailConstants.TH).append(entry.getKey()).append(EmailConstants.TH_END);
          cs.append(EmailConstants.TD).append(entry.getValue()).append(EmailConstants.TD_END);

        }
        t.append(EmailConstants.TR_END);
        cs.append(EmailConstants.TR_END);
        if (flag) {
          title = t.toString();
        }
        flag = false;
        contents.append(cs);
      }

      return getMessageFromHtmlTemplate(title, contents.toString());
    }

    return content;
  }

  /**
   * get alert message which type is TEXT
   *
   * @param content message content
   * @return alert message
   */
  private String getTextTypeMessage(String content) {

    if (StringUtils.isNotEmpty(content)) {
      // Converts an object type to an array type to prevent subsequent conversions from reporting errors
      try {
        Object contentObject = new JSONTokener(content).nextValue();
        if (!(contentObject instanceof JSONArray)) {
          ObjectNode jsonNodes = JSONUtils.parseObject(content);
          content = JSONUtils.toJsonString(Collections.singletonList(jsonNodes));
        }
      } catch (JSONException e) {
        logger.error("alert content is null");
      }
      ArrayNode list = JSONUtils.parseArray(content);
      StringBuilder contents = new StringBuilder(100);
      for (JsonNode jsonNode : list) {
        contents.append(EmailConstants.TR);
        contents.append(EmailConstants.TD).append(jsonNode.toString()).append(EmailConstants.TD_END);
        contents.append(EmailConstants.TR_END);
      }

      return getMessageFromHtmlTemplate(null, contents.toString());

    }

    return content;
  }

  /**
   * get alert message from a html template
   *
   * @param title   message title
   * @param content message content
   * @return alert message which use html template
   */
  private String getMessageFromHtmlTemplate(String title, String content) {

    requireNonNull(content, "content must not null");
    String htmlTableThead = StringUtils.isEmpty(title) ? "" : String.format("<thead>%s</thead>%n", title);

    return EmailConstants.HTML_HEADER_PREFIX + htmlTableThead + content + EmailConstants.TABLE_BODY_HTML_TAIL;
  }

}
